Growth and loss of distal tissue in blades of Lessonia nigrescens and Lessonia trabeculata (Laminariales)

摘要: Abstract Meristematic growth and loss of distal tissue from blades two ecologically important species in the south-east Pacific, Lessonia nigrescens trabeculata , was evaluated during 1 year. Comparative determined by a hole-punch method, subtracting final blade length (with loss) expected lengths (without loss); were transformed to fresh biomass units for calculation inter-algae differences. The results showed that elongation rate increased at beginning spring, declined towards end summer, with mean values between 0.40 0.08 cm day −1 L. 0.65–0.17 cm day . Loss varied seasonally when examined as both species; 0.24 0.10 cm day 0.51–0.25 cm day Variations only observed increasing 0.13 g (fresh weight) day Annual higher (0.41 0.39 cm day respectively) than L (0.19 0.15 cm day ). When considered biomass, monthly gains significantly outweighed species, but parallel based on data followed different trend. released about 50% its particulate organic matter, while comparative value 20%.